//http://www.zdnet.com/blog/burnette/how-to-use-multi-touch-in-android-2-part-5-implementing-the-drag-gesture/1789
// pich zoom an image 

package org.example.touch;

import org.example.touch.R;
import android.app.Activity;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.os.Bundle;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.view.ViewGroup.MarginLayoutParams;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class Hybrid extends Activity implements OnTouchListener {
	private static final String TAG = "Touch";
	private static final String TAG_ZOOM = "ZOOM_SCALE";
	Matrix matrix = new Matrix();
	Matrix savedMatrix = new Matrix();

	// We can be in one of these 3 states
	static final int NONE = 0;
	static final int DRAG = 1;
	static final int ZOOM = 2;
	int mode = NONE;
	PointF start = new PointF();
	PointF mid = new PointF();
	float oldDist = 1f;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		/*
		 * setContentView(R.layout.activity_main); ImageView view = (ImageView)
		 * findViewById(R.id.imageView); view.setOnTouchListener(this);
		 */

		setContentView(R.layout.completely_lay);
		LinearLayout view = (LinearLayout) findViewById(R.id.linearLayout);
		// View view = (ImageView) findViewById(R.id.imageView);
		view.setOnTouchListener(this);
	}

	@Override
	public boolean onTouch(View v, MotionEvent event) {
		// ImageView view = (ImageView) v;

		// dumpEvent(event);

		switch (event.getAction() & MotionEvent.ACTION_MASK) {

		case MotionEvent.ACTION_DOWN:
			// savedMatrix.set(matrix);
			start.set(event.getX(), event.getY());
			Log.d(TAG, "mode=DRAG");
			mode = DRAG;
			break;

		case MotionEvent.ACTION_UP:

		case MotionEvent.ACTION_POINTER_UP:
			mode = NONE;
			Log.d(TAG, "mode=NONE");
			break;

		case MotionEvent.ACTION_MOVE:
			if (mode == DRAG) {
				// matrix.set(savedMatrix);
				// matrix.postTranslate(event.getX() - start.x, event.getY() -
				// start.y);
				setPos(v, event.getX() - start.x, event.getY() - start.y);

			} else if (mode == ZOOM) {
				float newDist = spacing(event);
				Log.d(TAG, "newDist=" + newDist);
				if (newDist > 10f) {
					// matrix.set(savedMatrix);
					float scale = newDist / oldDist;

					Log.d(TAG_ZOOM, "uscale = " + scale);
					// if (scale<2f && scale>0.5f)
					// matrix.postScale(scale, scale, mid.x, mid.y);
					setScale(v, scale, scale, mid.x, mid.y);
				}
			}
			break;

		case MotionEvent.ACTION_POINTER_DOWN:
			oldDist = spacing(event);
			Log.d(TAG, "oldDist=" + oldDist);
			if (oldDist > 10f) {
				// savedMatrix.set(matrix);
				midPoint(mid, event);
				mode = ZOOM;
				Log.d(TAG, "mode=ZOOM");
			}
			break;
		}

		// Perform the transformation
		// view.setImageMatrix(matrix);

		return true; // indicate event was handled
	}

	private void setPos(View v, float x, float y) {
		v.setX(x);
		v.setY(y);
	}

	private void setScale(View v, float scaleX, float scaleY, float x, float y) {
		v.setPivotX(x);
		v.setPivotY(y);

		v.setScaleX(scaleX);
		v.setScaleY(scaleY);
	}

	private float spacing(MotionEvent event) {
		float x = event.getX(0) - event.getX(1);
		float y = event.getY(0) - event.getY(1);
		return FloatMath.sqrt(x * x + y * y);
	}

	private void midPoint(PointF point, MotionEvent event) {
		float x = event.getX(0) + event.getX(1);
		float y = event.getY(0) + event.getY(1);
		point.set(x / 2, y / 2);
	}

	/** Show an event in the LogCat view, for debugging */
	private void dumpEvent(MotionEvent event) {
		String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE",
				"POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" };
		StringBuilder sb = new StringBuilder();
		int action = event.getAction();
		int actionCode = action & MotionEvent.ACTION_MASK;
		sb.append("event ACTION_").append(names[actionCode]);
		if (actionCode == MotionEvent.ACTION_POINTER_DOWN
				|| actionCode == MotionEvent.ACTION_POINTER_UP) {
			sb.append("(pid ").append(
					action >> MotionEvent.ACTION_POINTER_ID_SHIFT);
			sb.append(")");
		}
		sb.append("[");
		for (int i = 0; i < event.getPointerCount(); i++) {
			sb.append("#").append(i);
			sb.append("(pid ").append(event.getPointerId(i));
			sb.append(")=").append((int) event.getX(i));
			sb.append(",").append((int) event.getY(i));
			if (i + 1 < event.getPointerCount())
				sb.append(";");
		}
		sb.append("]");
		Log.d(TAG, sb.toString());
	}
}
